极地研究

极地研究 ›› 2021, Vol. 33 ›› Issue (3): 451-458.DOI: 10. 3679/j.jdyj.20200062

• 研究进展 • 上一篇    下一篇

“雪龙2”号国内首套Sea Ⅲ型海洋重力仪应用分析

陈清满，王硕仁，袁东方   

  1. 中国极地研究中心, 上海 200136
  • 收稿日期:2020-09-09 修回日期:2020-11-25 接受日期:2020-11-30 出版日期:2021-09-30 发布日期:2021-10-13
  • 基金资助:
    新建极地科考破冰船项目(发改投资[2015]429号)

Performance analysis of the first set Sea III gravimeter on Xuelong 2

Chen Qingman, Wang Shuoren, Yuan Dongfang   

  1. Polar Research Institute of China, Shanghai 200136, China
  • Received:2020-09-09 Revised:2020-11-25 Accepted:2020-11-30 Online:2021-09-30 Published:2021-10-13

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摘要： Sea Ⅲ型海洋重力仪是Micro-g LaCoste公司在L&R SII型重力仪原理基础上开发的新型摆杆-斜拉零长弹簧海洋重力仪。本文以Sea Ⅲ型海洋重力仪在“雪龙2”号上应用为例, 梳理了Sea Ⅲ型海洋重力仪工作原理、重力计算公式、结构特点和优势。对其静态试验及海上动态性能测试进行研究, 通过设计重复线、交叉点来评估仪器的动态精度情况。试验表明Sea Ⅲ静态线性月漂移约为0.85×10−5 m·s2, 重力仪观测值能够清晰反映当地固体潮变化特征, 动态内符合精度为0.23×10−5 m·s2, 均远优于海洋调查规范相关标准要求。在此基础上, 结合“雪龙2”号船型、设备布置等分析总结仪器数据处理流程及仪器性能指标, 为后续相关用户提供参考。

关键词: 海洋重力仪, Sea Ⅲ, “雪龙2”号, 月漂移, 动态精度

Abstract:

The Sea III gravimeter is a new type of pendulum-sliding zero-length spring sea gravity-measuring instrument developed by Micro-g LaCoste manufacturer based on the principles of the LaCoste & Romberg SII gravimeter. In this paper, we have done a performance test of the Sea III gravimeter on Xuelong 2. Firstly, we gave a comprehensive introduction of its working principles, calculate formula and structural characteristics in order to describe the advantage of the Sea III gravimeter. Then the performance of the instrument had been tested both in a static and dynamic way. Xuelong 2 has been designed to sail in a repetitive lane to evaluate its dynamical accuracy. The tests show that the static linear drift rate of the Sea III is about 3.28 × 10−12 m·s2 while the gravimeter records present a clearly characteristic of local earth tide. The dynamic internal compliance accuracy is about 0.23 ×10−5 m·s2, which is far better than the relevant marine survey specification standards. Besides that, the type of Xuelong 2 icebreaker, its equipment layout, gravimetric data processing flow and instrumental performance evaluation are all documented in order to provide a meaningful reference for future users.

Key words: marine gravimeter, Sea III, Xuelong 2, monthly drift, dynamic accuracy